Watch the video below to see a demonstration of proper form and technique for the wall sit exercise. You can also check out some more quads exercise videos or find exercises for other muscle groups.
To perform a set of wall sit:
Lean your back against the wall with your feet on the ground, shoulder width apart. Your trunk should be in a neutral position and almost entirely against the wall.
Keeping your knees directly over your ankles, slowly bend them to slide your body down the wall until your knees are bent 90 degrees. Your trunk should continue to be in a neutral position during this motion.
Pause at the bottom position for the specified duration. Be sure to maintain tension to keep your body for sliding any further down.
Remember to breathe normally throughout the entire movement.
Repeat steps 1 through 4 until you have completed the desired number of isometric wall sit repetitions for the prescribed duration before resting.
This completes one set of wall sit.